Thin linear ultrasonic motor

In this study, we propose a miniature linear ultrasonic motor that uses a thin hollow square stator. The miniature stator has a height and width of 4.5 mm and a thickness of less than 1 mm with a center hole of 2.7 mm for inserting the slider. The slider is designed to have a slightly larger diameter than the diameter of the stator hole, and the cylinder expands radially and contacts the inner surface of the rigid stator. This design provides both a hollow structure for centering a lens and an optimal preload for enhancing the motor thrust force. We build a tiny thin linear ultrasonic motor, characterize its performance, and demonstrate a visual feedback control for camera module applications.

Publications

1. Shunsuke Izuhara, Tomoaki Mashimo, "Design and characterization of a thin linear ultrasonic motor for miniature focus systems," Sensors and Actuators A: Physical (2021): 112797.